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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
package org.apache.fop.fo;
import org.xml.sax.Locator;
import org.apache.fop.apps.FOPException;
/**
* Base class for representation of mixed content formatting objects
* (i.e., those that can contain both child FO's and text nodes/PCDATA).
* It should not be instantiated directly.
*/
public abstract class FObjMixed extends FObj {
/** Represents accumulated, pending FO text. See flushText(). */
protected FOText ft = null;
/** Used for white-space handling; start CharIterator at node ... */
protected FONode currentTextNode;
/**
* @param parent FONode that is the parent of this object
*/
protected FObjMixed(FONode parent) {
super(parent);
}
/** @see org.apache.fop.fo.FONode */
protected void addCharacters(char[] data, int start, int end,
PropertyList pList,
Locator locator) throws FOPException {
if (ft == null) {
ft = new FOText(this);
ft.setLocator(locator);
ft.bind(pList);
}
ft.addCharacters(data, start, end, null, null);
}
/** @see org.apache.fop.fo.FONode#endOfNode() */
protected void endOfNode() throws FOPException {
flushText();
getFOEventHandler().whiteSpaceHandler
.handleWhiteSpace(this, currentTextNode);
super.endOfNode();
}
/**
* Adds accumulated text as one FOText instance.
* Makes sure that nested calls to itself do nothing.
* @throws FOPException if there is a problem during processing
*/
protected void flushText() throws FOPException {
if (ft != null) {
FOText lft = ft;
ft = null;
lft.endOfNode();
getFOEventHandler().characters(lft.ca, lft.startIndex, lft.endIndex);
addChildNode(lft);
}
}
/**
* @see org.apache.fop.fo.FONode#addChildNode(FONode)
*/
protected void addChildNode(FONode child) throws FOPException {
flushText();
if (child instanceof FOText || child.getNameId() == FO_CHARACTER) {
if (currentTextNode == null) {
currentTextNode = child;
}
} else {
// handle white-space for all text up to here
getFOEventHandler().whiteSpaceHandler
.handleWhiteSpace(this, currentTextNode, child);
currentTextNode = null;
}
super.addChildNode(child);
}
/**
* @return iterator for this object
*/
public CharIterator charIterator() {
return new RecursiveCharIterator(this);
}
}
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